What are the important aspects of flywheel batteries?

The flywheel battery takes into account many advantages of energy storage devices such as chemical batteries, fuel power batteries and superconducting batteries, and is mainly manifested in the following aspects: (1) High energy density: energy storage density can reach 100-200wh/kg, power density It can reach 5000～l0000w/kg. (2) High energy conversion efficiency: work efficiency is as high as 90%. (3) Small size and light weight: the diameter of the flywheel is about 20 cm, and the total weight is about ten kilograms. (4) Wide operating temperature range: There is no strict requirement on the ambient temperature. (5) Long service life: It is not affected by repeated deep discharge, can cycle millions of times, and has an expected service life of more than 20 years. (6) Low loss and low maintenance: The magnetic bearing and the vacuum environment make the mechanical loss negligible, and the system maintenance cycle is long. The shortcomings of the flywheel battery are important in two aspects: (1) In actual work, the speed of the flywheel can reach 40,000～50,000r/min. Generally, the flywheel made of metal cannot withstand such a high speed and is easy to disintegrate, so the flywheel Generally, they are made of carbon fiber, and the carbon fiber material used to manufacture the flywheel is still very expensive and the cost is relatively high. (2) Once the flywheel is charged, it will keep rotating. When I was not using electricity, the flywheel was still spinning there, wasting energy. For example, after charging a car with a flywheel battery, the car can run for three hours. After the car has been away for two hours, the car will mainly eat for half an hour. Then, the flywheel will spin for nothing during this half an hour. However, it is also said that when the flywheel is idling, because there is no load, the energy loss will not be too large, which is less than the energy loss of the current storage battery that is not used for a period of time. If it stands still, there is almost no energy loss. The solution: equip the flywheel battery with a chemical rechargeable battery. When the electricity is not needed, the electric energy from the rotation of the flywheel can be charged into the chemical battery. However, the problem with equipping the flywheel battery with a chemical battery is that it increases the weight of the car or equipment. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What usage habits will cause the battery life of electric vehicles to be too short?